CVE-2026-74222

Bootloader crash via freed TCP connection reuse

Published Sep 29, 2026 · Updated Sep 29, 2026

Use-after-free in U-Boot's lwIP wget before 2026.10-rc5 allows context-dependent attackers to crash the bootloader during an HTTP download. On a failed data store, httpc_recv_cb() aborts and frees the TCP connection PCB but returns ERR_BUF, so the TCP input path accesses released memory. The fault requires lwIP wget to be enabled and a storage failure; the upstream patch does not establish that a network peer can force that failure.

CVSS severityUnavailable
Unscored
EPSS probability0.30%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in U-Boot's lwIP wget before 2026.10-rc5 allows context-dependent attackers to crash the bootloader during an HTTP download. On a failed data store, httpc_recv_cb() aborts and frees the TCP connection PCB but returns ERR_BUF, so the TCP input path accesses released memory. The fault requires lwIP wget to be enabled and a storage failure; the upstream patch does not establish that a network peer can force that failure.

The record

CVE
CVE-2026-74222
Published
Sep 29, 2026
Updated
Sep 29, 2026
Vendor
DENX Software Engineering GmbH
Product
U-Boot
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.10-rc5

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

DENX Software Engineering GmbH · U-Bootversion=0 <2026.10-rc5

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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